#include<stdio.h>
#include<unistd.h>

int main()
{
    pid_t id = fork();
    if(id < 0)
    {
        perror("fork");
    }
    else if(id == 0)
    {
        while(1)
        {
            printf("I am the child process, pid = %d, ppid = %d\n", getpid(), getppid());
            sleep(1);
        }
    }
    else
    {
        while(1)
        {
            printf("I am the father process, pid = %d, ppid = %d\n", getpid(), getppid());
            sleep(1);
        }
    }

    return 0;
}
